1. Introduction
This manual provides essential instructions for the safe and effective use of the Keyence FS-V31 Fiber Optic Sensor. The FS-V31 is a digital, single-control fiber optic sensor designed for industrial applications, featuring NPN output and selectable Light-ON/Dark-ON operation. It operates on a 12-24 VDC input and has a low power consumption of 0.71 WATT.
Please read this manual thoroughly before installation, operation, or maintenance to ensure proper functionality and to prevent potential hazards.
2. Safety Information
Observe the following safety precautions to prevent injury to personnel and damage to the equipment.
- Electrical Safety: Ensure the power supply is disconnected before wiring or performing any maintenance. Incorrect wiring can lead to electric shock or equipment damage.
- Power Supply: Use only a 12-24 VDC power supply as specified. Exceeding this voltage range can damage the sensor.
- Environment: Do not install the sensor in locations subject to excessive vibration, shock, high temperatures, corrosive gases, or direct sunlight.
- Wiring: All wiring should be performed by qualified personnel in accordance with local electrical codes.
- Modifications: Do not attempt to disassemble, repair, or modify the sensor. Unauthorized modifications can lead to malfunction and void the warranty.
3. Product Overview and Components
The Keyence FS-V31 Fiber Optic Sensor consists of the main sensor unit and an integrated cable. Key features include control buttons and indicator lights for easy setup and monitoring.
Figure 3.1: Keyence FS-V31 Sensor Unit. This image displays the main sensor body with its integrated cable, clearly showing the product label with model information and serial number.
Figure 3.2: Keyence FS-V31 Wiring Details. This image provides a closer view of the sensor's wiring, indicating the color codes for power (BROWN, BLUE) and output (BLACK), along with the CE compliance mark.
Figure 3.3: Keyence FS-V31 Control Panel. A detailed view of the sensor's control interface, highlighting the 'SEL' (Select), 'MODE', 'SET', and 'DSC' buttons, which are used for configuration and adjustment.
4. Setup and Installation
4.1 Mounting
Mount the FS-V31 sensor securely in a location free from excessive vibration and heat. Ensure adequate space for wiring and access to control buttons. Use appropriate mounting hardware (not included) for your specific application.
4.2 Wiring
Refer to Figure 3.2 for wiring color codes. Connect the sensor to a stable 12-24 VDC power supply according to the following:
- BROWN Wire: Connect to +V (Positive DC Power Supply)
- BLUE Wire: Connect to 0V (Negative DC Power Supply / Ground)
- BLACK Wire: NPN Output (Connect to load, then to +V)
Ensure all connections are secure and insulated to prevent short circuits.
5. Operation
5.1 Power On
Once wired correctly, apply 12-24 VDC power. The sensor will power on, and indicator lights will illuminate to show its status.
5.2 Light-ON / Dark-ON Selection
The FS-V31 allows selection between Light-ON and Dark-ON modes. In Light-ON mode, the output activates when light is detected. In Dark-ON mode, the output activates when light is interrupted (darkness is detected).
Refer to Figure 3.3 for control button locations. Use the 'MODE' or 'SEL' button to cycle through operating modes. Consult the sensor's display (if present) or indicator lights to confirm the selected mode.
5.3 Sensitivity Adjustment
The 'SET' and 'DSC' buttons (refer to Figure 3.3) are typically used for sensitivity adjustment or teaching functions. Follow these general steps:
- Place the target object in the desired detection position.
- Press and hold the 'SET' button (or follow specific sequence) to initiate teaching.
- Remove the target object (if applicable for 2-point teaching).
- Press the 'SET' button again to complete the teaching process.
The sensor will automatically adjust its threshold for optimal detection based on the taught conditions.
6. Maintenance
The Keyence FS-V31 is designed for minimal maintenance. However, regular inspection and cleaning can prolong its lifespan and ensure reliable operation.
- Cleaning: Periodically clean the sensor's detection surface and housing with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Cable Inspection: Check the integrated cable for any signs of damage, such as cuts, abrasions, or kinks. Replace the sensor if the cable is damaged.
- Mounting Security: Verify that the sensor remains securely mounted and that all connections are tight.
7. Troubleshooting
If the sensor is not operating as expected, refer to the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Sensor does not power on. | No power supply, incorrect wiring, or faulty power supply. | Check power connections (BROWN to +V, BLUE to 0V). Verify power supply voltage (12-24 VDC). |
| Output does not switch. | Incorrect Light-ON/Dark-ON mode, improper sensitivity adjustment, or target out of range. | Verify selected operating mode. Re-adjust sensitivity using 'SET' button. Ensure target is within detection range. |
| Erratic detection. | Dust/dirt on sensor lens, external light interference, or unstable mounting. | Clean sensor lens. Shield sensor from strong ambient light. Securely mount the sensor. |
8. Specifications
| Parameter | Value |
|---|---|
| Model | FS-V31 |
| Brand | Keyence |
| Input Voltage | 12-24 VDC |
| Power Consumption | 0.71 WATT |
| Output Type | NPN |
| Operation Mode | Light-ON / Dark-ON Selectable |
| Control Type | Single Control, Digital |
| Product Dimensions | 5 x 5 x 1 inches |
| Product Weight | 2 Pounds |
| Manufacturer | KEYENCE CORP |
| Date First Available | January 1, 2016 |
9. Warranty and Support
Specific warranty terms for the Keyence FS-V31 Fiber Optic Sensor are provided by the manufacturer or authorized seller at the time of purchase. Please retain your proof of purchase for warranty claims.
For technical support, service, or detailed warranty information, please contact Keyence Corporation directly or your local Keyence distributor. You can find more information on their official website: www.keyence.com.
